Winpalace Play Casino - Denied payment

I won over 30000 playing blackjack back in November, they have been paying me extremely slowly about $500 every ten days, I have continuted to play on the site while waiting patiently for my payment and have dwindled it down to 13000, they denied my most recent request and said i have to deposit money to get paid, this makes no sense why would i put in $1000 to get out $1000? This is completely absurd, i just want the money i won fairly playing their games under their rules.